Well, without having read the 'lolth's warrior a novel', it could be centered around the character who is a warrior. Maybe this warrior has some special powers or abilities bestowed by Lolth. It could be a story of the warrior's struggle, either against enemies of Lolth or those who oppose the warrior's own beliefs and goals. The novel might also explore the relationship between the warrior and the world or society that Lolth is part of.
Since I don't have access to the actual book, here are some possible things it could be about. It could be about the warrior's origin story. How did they become a warrior associated with Lolth? It might also deal with moral and ethical dilemmas the warrior faces. For example, if Lolth has some rather cruel or complex demands, how does the warrior navigate that? Additionally, it could involve the warrior's relationships with other characters in the story, whether they are allies, rivals, or something in between. And perhaps there are epic battles and challenges that the warrior must overcome to fulfill their purpose in the story related to Lolth.